What is the tolerance on the altimeter?

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Prepare for the SkyWest Indoctrination Validation with flashcards and multiple choice questions. Each question is equipped with helpful hints and in-depth explanations. Get ready to ace your exam!

Multiple Choice

What is the tolerance on the altimeter?

Explanation:
When your altimeter is set to the local pressure (QNH) and you’re on the ground, it should read the actual field elevation within about 75 feet. This tolerance keeps height above the surface reliable for safe taxiing, takeoff, and landing, and it provides a clear preflight check to catch mis-set or malfunctioning instruments. If the reading is off by more than roughly 75 feet, it indicates an issue that needs correction before flight. The other numbers don’t match this standard ground-tolerance value, which is why 75 feet is the correct reference.

When your altimeter is set to the local pressure (QNH) and you’re on the ground, it should read the actual field elevation within about 75 feet. This tolerance keeps height above the surface reliable for safe taxiing, takeoff, and landing, and it provides a clear preflight check to catch mis-set or malfunctioning instruments. If the reading is off by more than roughly 75 feet, it indicates an issue that needs correction before flight. The other numbers don’t match this standard ground-tolerance value, which is why 75 feet is the correct reference.

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